*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
body {
  background: #070b1f;
  min-height: 100dvh;
  font-family: 'Segoe UI', system-ui, sans-serif;
  color: #fff;
  overflow-x: hidden;
}

/* ── STARS ── */
.stars { position:fixed; inset:0; pointer-events:none; z-index:0; }
.star  { position:absolute; border-radius:50%; background:#fff; animation:twinkle var(--d,3s) ease-in-out infinite alternate; }
@keyframes twinkle { from{opacity:.1;transform:scale(.7)} to{opacity:1;transform:scale(1.3)} }

/* ── NEBULAS ── */
.nebula { position:fixed; border-radius:50%; filter:blur(80px); pointer-events:none; z-index:0; }
.nb1 { width:400px;height:400px; background:radial-gradient(circle,rgba(236,72,153,.22) 0%,transparent 70%); top:-120px;left:-100px; animation:nbD 13s ease-in-out infinite alternate; }
.nb2 { width:340px;height:340px; background:radial-gradient(circle,rgba(124,58,237,.24) 0%,transparent 70%); bottom:80px;right:-90px; animation:nbD 10s ease-in-out infinite alternate-reverse; }
.nb3 { width:240px;height:240px; background:radial-gradient(circle,rgba(0,245,255,.12) 0%,transparent 70%); top:42%;left:32%; animation:nbD 8s ease-in-out infinite alternate; }
@keyframes nbD { from{transform:translate(0,0) scale(1)} to{transform:translate(16px,22px) scale(1.1)} }

/* ── PARTICLE CANVAS ── */
#pCvs { position:fixed;inset:0;pointer-events:none;z-index:10; }

/* ── LAYOUT ── */
.app { position:relative;z-index:1;max-width:420px;margin:0 auto;padding:0 16px 110px;min-height:100dvh;display:flex;flex-direction:column; }

/* ══════════════════
   TOP BAR
══════════════════ */
.top-bar {
  display:flex;align-items:center;justify-content:space-between;
  padding:18px 0 14px;
  position:sticky;top:0;z-index:50;
  background:linear-gradient(180deg,rgba(7,11,31,1) 0%,rgba(7,11,31,0) 100%);
  padding-bottom:18px;
}
.logo-txt {
  font-size:1.2rem;font-weight:900;
  background:linear-gradient(135deg,#f9a8d4,#a78bfa,#34d399);
  background-size:200%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;
  animation:logoShift 4s ease-in-out infinite;
}
@keyframes logoShift{0%,100%{background-position:0%}50%{background-position:100%}}
.back-btn {
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.1);
  border-radius:50px;padding:7px 16px;
  font-size:.82rem;font-weight:700;color:#fff;
  cursor:pointer;text-decoration:none;
  display:flex;align-items:center;gap:6px;
  transition:background .2s,transform .15s;
}
.back-btn:hover{background:rgba(255,255,255,.15);transform:scale(1.04);}

/* ══════════════════
   HERO
══════════════════ */
.hero {
  display:flex;flex-direction:column;align-items:center;
  padding:10px 0 24px;gap:10px;
}
.flag-orbit {
  position:relative;width:90px;height:90px;
  display:flex;align-items:center;justify-content:center;
}
.flag-orb {
  width:80px;height:80px;border-radius:50%;
  background:linear-gradient(135deg,rgba(236,72,153,.25),rgba(124,58,237,.25));
  border:2px solid rgba(236,72,153,.3);
  display:flex;align-items:center;justify-content:center;
  font-size:2.6rem;
  box-shadow:0 0 30px rgba(236,72,153,.3),inset 0 0 20px rgba(124,58,237,.15);
  animation:orbFloat 3s ease-in-out infinite;
}
@keyframes orbFloat{0%,100%{transform:translateY(0) rotate(-4deg)}50%{transform:translateY(-10px) rotate(4deg)}}
/* Orbit ring */
.orbit-ring {
  position:absolute;inset:-10px;border-radius:50%;
  border:2px dashed rgba(255,255,255,.1);
  animation:orbitSpin 10s linear infinite;
}
@keyframes orbitSpin{to{transform:rotate(360deg)}}
/* Small dot on ring */
.orbit-dot {
  position:absolute;top:-4px;left:50%;transform:translateX(-50%);
  width:8px;height:8px;border-radius:50%;
  background:#ec4899;box-shadow:0 0 10px #ec4899;
}

.hero-title {
  font-size:1.9rem;font-weight:900;text-align:center;line-height:1.1;
  background:linear-gradient(135deg,#f9a8d4,#c4b5fd,#6ee7b7);
  background-size:200%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;
  animation:logoShift 5s ease-in-out infinite;
}
.hero-sub { font-size:.82rem;color:#475569;font-weight:600;text-align:center; }

/* ══════════════════
   DIFFICULTY SECTION
══════════════════ */
.section-label {
  font-size:.65rem;font-weight:800;letter-spacing:1.8px;
  text-transform:uppercase;color:#475569;
  margin-bottom:11px;display:flex;align-items:center;gap:8px;
}
.section-label::after{content:'';flex:1;height:1px;background:rgba(255,255,255,.07);}

/* 3-col grid */
.diff-grid { display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin-bottom:10px; }

.diff-card {
  background:rgba(255,255,255,.05);
  border:2px solid rgba(255,255,255,.09);
  border-radius:18px;padding:16px 8px 14px;
  display:flex;flex-direction:column;align-items:center;gap:7px;
  cursor:pointer;position:relative;overflow:hidden;
  transition:transform .2s,border-color .25s,background .25s,box-shadow .25s;
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.07),0 4px 20px rgba(0,0,0,.3);
  -webkit-tap-highlight-color:transparent;
}
.diff-card::before{content:'';position:absolute;inset:0;border-radius:inherit;background:linear-gradient(135deg,rgba(255,255,255,.05),transparent 60%);pointer-events:none;}
.diff-card::after{content:'';position:absolute;top:0;left:10%;right:10%;height:2px;border-radius:0 0 2px 2px;opacity:0;transition:opacity .25s;}

.diff-card:hover:not(.sel){transform:translateY(-4px) scale(1.04);border-color:rgba(255,255,255,.2);box-shadow:inset 0 1px 0 rgba(255,255,255,.1),0 12px 28px rgba(0,0,0,.4);}

/* LAKO — green */
.card-easy.sel,.card-easy:hover{border-color:#22c55e;background:rgba(34,197,94,.09);box-shadow:0 0 0 3px rgba(34,197,94,.2),0 0 32px rgba(34,197,94,.28),inset 0 0 20px rgba(34,197,94,.07);}
.card-easy.sel::after,.card-easy:hover::after{background:#22c55e;opacity:1;}
.card-easy.sel{transform:translateY(-4px) scale(1.05);animation:pulseG 1.8s ease-in-out infinite;}
@keyframes pulseG{0%,100%{box-shadow:0 0 0 3px rgba(34,197,94,.2),0 0 32px rgba(34,197,94,.28)}50%{box-shadow:0 0 0 4px rgba(34,197,94,.35),0 0 52px rgba(34,197,94,.45)}}

/* SREDNJE — violet */
.card-mid.sel,.card-mid:hover{border-color:#a78bfa;background:rgba(167,139,250,.09);box-shadow:0 0 0 3px rgba(167,139,250,.22),0 0 32px rgba(167,139,250,.3),inset 0 0 20px rgba(167,139,250,.07);}
.card-mid.sel::after,.card-mid:hover::after{background:#a78bfa;opacity:1;}
.card-mid.sel{transform:translateY(-4px) scale(1.05);animation:pulseV 1.8s ease-in-out infinite;}
@keyframes pulseV{0%,100%{box-shadow:0 0 0 3px rgba(167,139,250,.22),0 0 32px rgba(167,139,250,.3)}50%{box-shadow:0 0 0 4px rgba(167,139,250,.4),0 0 52px rgba(167,139,250,.5)}}

/* TEŠKO — red/orange */
.card-hard.sel,.card-hard:hover{border-color:#f87171;background:rgba(248,113,113,.09);box-shadow:0 0 0 3px rgba(248,113,113,.2),0 0 32px rgba(248,113,113,.28),inset 0 0 20px rgba(248,113,113,.07);}
.card-hard.sel::after,.card-hard:hover::after{background:#f87171;opacity:1;}
.card-hard.sel{transform:translateY(-4px) scale(1.05);animation:pulseR 1.8s ease-in-out infinite;}
@keyframes pulseR{0%,100%{box-shadow:0 0 0 3px rgba(248,113,113,.2),0 0 32px rgba(248,113,113,.28)}50%{box-shadow:0 0 0 4px rgba(248,113,113,.38),0 0 52px rgba(248,113,113,.45)}}

.d-icon{font-size:2rem;line-height:1;transition:transform .25s;}
.diff-card.sel .d-icon{animation:iconPop .5s cubic-bezier(.34,1.56,.64,1);}
@keyframes iconPop{0%{transform:scale(.6)}60%{transform:scale(1.25)}100%{transform:scale(1)}}

.d-num{font-size:1.7rem;font-weight:900;line-height:1;}
.card-easy .d-num{color:#4ade80;text-shadow:0 0 14px rgba(74,222,128,.4);}
.card-mid  .d-num{color:#c4b5fd;text-shadow:0 0 14px rgba(196,181,253,.4);}
.card-hard .d-num{color:#f87171;text-shadow:0 0 14px rgba(248,113,113,.4);}

.d-name{font-size:.75rem;font-weight:800;color:rgba(255,255,255,.75);text-align:center;}
.d-sub {font-size:.62rem;color:#475569;text-align:center;font-weight:600;}
.diff-card.sel .d-name{color:#fff;}

/* checkmark */
.d-check{position:absolute;top:7px;right:7px;width:18px;height:18px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.62rem;font-weight:900;opacity:0;transform:scale(0);transition:opacity .25s,transform .3s cubic-bezier(.34,1.56,.64,1);}
.diff-card.sel .d-check{opacity:1;transform:scale(1);}
.card-easy .d-check{background:#22c55e;}
.card-mid  .d-check{background:#a78bfa;}
.card-hard .d-check{background:#f87171;}

/* ══════════════════
   WIDE CARD (all flags)
══════════════════ */
.all-card {
  background:rgba(255,255,255,.05);
  border:2px solid rgba(255,255,255,.09);
  border-radius:18px;padding:16px 18px;
  display:flex;align-items:center;gap:14px;
  cursor:pointer;position:relative;overflow:hidden;
  transition:all .25s;margin-bottom:14px;
  backdrop-filter:blur(10px);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.07),0 4px 20px rgba(0,0,0,.3);
  -webkit-tap-highlight-color:transparent;
}
.all-card::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,255,255,.04),transparent 60%);pointer-events:none;}
.all-card:hover:not(.sel){border-color:rgba(255,255,255,.2);transform:translateY(-2px);box-shadow:0 10px 28px rgba(0,0,0,.4);}
/* all — cyan */
.all-card.sel{border-color:#00f5ff;background:rgba(0,245,255,.08);box-shadow:0 0 0 3px rgba(0,245,255,.18),0 0 32px rgba(0,245,255,.25);animation:pulseCyan 1.8s ease-in-out infinite;}
@keyframes pulseCyan{0%,100%{box-shadow:0 0 0 3px rgba(0,245,255,.18),0 0 32px rgba(0,245,255,.25)}50%{box-shadow:0 0 0 4px rgba(0,245,255,.32),0 0 52px rgba(0,245,255,.42)}}
.all-card.sel .d-check{opacity:1;transform:scale(1);}
.all-card .d-check{background:#00f5ff;color:#000;position:absolute;top:12px;right:12px;}
.all-orb{width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,rgba(0,245,255,.2),rgba(124,58,237,.2));border:1px solid rgba(0,245,255,.25);display:flex;align-items:center;justify-content:center;font-size:1.6rem;flex-shrink:0;animation:orbFloat 4s ease-in-out infinite;box-shadow:0 0 16px rgba(0,245,255,.2);}
.all-info .all-title{font-size:.95rem;font-weight:800;}
.all-info .all-sub{font-size:.68rem;color:#475569;margin-top:3px;font-weight:600;}
.all-card.sel .all-title{color:#00f5ff;}

/* ══════════════════
   META INFO
══════════════════ */
.meta-row{display:flex;align-items:center;justify-content:center;gap:16px;margin-bottom:20px;}
.meta-pill{display:flex;align-items:center;gap:6px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);border-radius:20px;padding:6px 12px;font-size:.72rem;font-weight:700;color:#64748b;}
.meta-pill span{font-size:.85rem;}

/* ══════════════════
   LAUNCH BUTTON
══════════════════ */
.launch-wrap{margin-top:auto;}
.launch-btn{
  width:100%;padding:16px 20px;border:none;border-radius:20px;
  font-size:1.05rem;font-weight:900;letter-spacing:.3px;
  cursor:pointer;display:flex;align-items:center;justify-content:center;gap:10px;
  text-decoration:none;position:relative;overflow:hidden;
  transition:transform .15s,box-shadow .15s,opacity .3s;
}
.launch-btn::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,255,255,.12),transparent 60%);pointer-events:none;}
.launch-btn.ready{
  background:linear-gradient(135deg,#ec4899,#7c3aed,#4f46e5);
  background-size:200%;
  box-shadow:0 6px 28px rgba(236,72,153,.45),0 2px 0 rgba(255,255,255,.1) inset;
  animation:btnS 3s ease-in-out infinite;
}
@keyframes btnS{0%,100%{background-position:0%}50%{background-position:100%}}
.launch-btn.ready:hover{transform:translateY(-2px) scale(1.02);box-shadow:0 10px 36px rgba(236,72,153,.6);}
.launch-btn.ready:active{transform:scale(.97);}
.launch-btn.dim{
  background:rgba(255,255,255,.07);
  color:rgba(255,255,255,.3);
  box-shadow:none;cursor:default;
  border:1px solid rgba(255,255,255,.08);
}
.btn-icon{font-size:1.2rem;animation:btnFlag 1s ease-in-out infinite alternate;}
@keyframes btnFlag{from{transform:rotate(-8deg)}to{transform:rotate(8deg)}}
.launch-btn.dim .btn-icon{animation:none;}

/* ══════════════════
   BOTTOM NAV
══════════════════ */
nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:420px;background:rgba(7,11,31,.93);backdrop-filter:blur(16px);border-top:1px solid rgba(255,255,255,.07);display:flex;align-items:center;justify-content:space-around;padding:8px 0 max(12px,env(safe-area-inset-bottom));z-index:100;}
.nav-item{display:flex;flex-direction:column;align-items:center;gap:3px;font-size:.65rem;color:#64748b;cursor:pointer;text-decoration:none;transition:color .2s;}
.nav-item.active{color:#a78bfa;}
.nav-item span{font-size:1.3rem;}
.nav-orb{width:52px;height:52px;background:linear-gradient(135deg,#7c3aed,#4f46e5);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;box-shadow:0 0 20px rgba(124,58,237,.6);margin-top:-20px;border:3px solid rgba(7,11,31,.9);cursor:pointer;text-decoration:none;animation:orbPulse 2s ease-in-out infinite alternate;}
@keyframes orbPulse{from{box-shadow:0 0 14px rgba(124,58,237,.5)}to{box-shadow:0 0 30px rgba(124,58,237,.9)}}